All microorganisms are best defined as organisms that
A. cause human disease.
B. lack a cell nucleus.
C. are infectious particles.
D. can only be found growing in laboratories.
E. are too small to be seen with the unaided eye.
Answer: E
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Which of the following choices best describes the relationship that exists between moisture and air temperature?
A. The moisture-holding capacity of air decreases when it is warm and increases when it is cool. B. The moisture-holding capacity of air remains the same (warm or cool) and is not related to its temperature. C. The moisture-holding capacity of air increases when it is warm and decreases when it is cool. D. The moisture-holding capacity of air decreases as the higher altitude winds of the polar regions descend onto the continents.
The unexpressed regions of split genes are called
A. exons. B. introns. C. endons. D. codons.
In contrast to alpha radiation, beta radiation:
A) is easily stopped by a piece of paper. B) travels slowly and is less penetrating. C) can easily penetrate the human body. D) requires a layer of clothing to stop it.
A cause of epiglottitis in children and young adults is
A. Haemophilus influenzae. B. Haemophilus ducreyi. C. Haemophilus aegyptius. D. Haemophilus parainfluenzae. E. Haemophilus aphrophilus.